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Finding the Fourth Proportional to 1,397.60, 1,928.80 and 838.09

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Solution

The fourth proportional to 1,397.60, 1,928.80 and 838.09 is: 1,156.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.60 : 1,928.80 = 838.09 : x
  2. Step 2: Convert to fraction form
    1,397.60/1,928.80 = 838.09/x
  3. Step 3: Cross multiply
    1,397.60x = 1,928.80 × 838.09
  4. Step 4: Simplify right side
    1,397.60x = 1,616,503.80
  5. Step 5: Solve for x
    x = 1,616,503.80/1,397.60
  6. Step 6: Final answer
    x = 1,156.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.